Hello, I have a 1990 Geo Metro XFI that normally gets about 55 to 58 mpg on the freeway. I rebuilt the engine last summer and just now put in a new hho unit that I built myself. It's putting about 1/2 liter per minute at 13 amps. I bought a efie and have it installed but still working out some bugs. Right now it seems to get worse than better. There are still some things to work out and I will be working on them this week.

I just installed an HHO dry cell unit on a 94 Geo Metro. It runs at about 12 amps. The car was getting 48 MPG before the installation and nothing has changed, even with a digital narrowband EFIE adjusted all the way down to .090 mV. There's no drop in power, but no increase in economy either. Im not sure what the issue is. Any ideas?